Introduction to Ruby Programming Language

Created for For SARCCOM Indonesia meetup

Transcript

1. Ruby Programming Language
2. Didik Wicaksono CTO Cookpad Indonesia
3. Github: firewalker06 Twitter: did1k
4. I work in
5. Its where I learn to program with Ruby
6. The question is: Why Ruby?
7. Meet Matz
8. He invented Ruby in 1995
9. He designed Ruby to be human-oriented
10. Ruby syntax is designed to be elegant
11. print "elephant" if "elephant".include? "ant" "elephant"
12. print "elephant" if "elephant".include? "ant" You can speak this in proper english: “Print an elephant if elephant include ant”
13. print "elephant" if "elephant".include? "ant" You can speak this in proper english: “Print elephant if elephant include ant”
14. print "elephant" if "elephant".include? "ant" You can speak this in proper english: “Print elephant if elephant include ant”
15. This sentence still doesn’t make any sense, but it is readable You can speak this in proper english: “Print elephant if elephant include ant” print "elephant" if "elephant".include? "ant"
16. print "elephant" if "elephant".include? "ant" “if” can be used to modify expression
17. print "elephant" if "elephant".include? "ant" “if” can be used to modify expression Method name can have question mark
18. Writing Ruby code is easy because it can be written in plain english
19. Programmer can express themselves into their code
20. movie.awesome? bedroom.with_twin_beds? recipe.cooked_under 10.minutes Programmer can express themselves into their code
21. humans.obliterate!
22. humans.obliterate! unless humans.nice?
23. There are more than one way to do anything in Ruby
24. false 2.negative? 2 < 0
25. "hello" puts "hello" $stdout.puts "hello" p "hello"
26. one = 1 two = 2 three = 3 one, two, three = [1, 2, 3]
27. one = 1 two = 2 three = 3 one, two, three = [1, 2, 3] one, two, three = 1, 2, 3 You don’t even need
28. [1, 2, 3, 4, 5].map { |element| element if element.even? }.compact [2,4]
29. [1, 2, 3, 4, 5]. select { |element| element.even? } [2,4]
30. [1, 2, 3, 4, 5].select(&:even?) [2,4]
31. Block arguments also makes Ruby popular
32. method do ... end method do |argument| ... end
33. %w(Google Yahoo MSN).map do |engine| "https://www.#{engine.downcase}.com" end ["https://www.google.com", "https://www.yahoo.com", "https://www.msn.com"]
34. Blocks allows us to attach closure to any method %w(Google Yahoo MSN).map do |engine| "https://www.#{engine.downcase}.com" end this will be returned
35. Blocks allows us to attach closure to any method %w(Google Yahoo MSN).map do |engine| "https://www.#{engine.downcase}.com" end this will be returned You don’t even need to write return
36. Almost forgot! %w(Google Yahoo MSN).map do |engine| "https://www.#{engine.downcase}.com" end Is equal: ["Google", "Yahoo", "MSN"]
37. More Blocks
38. %w(jakarta bandung).map do |city| city.capitalize end
39. %w(jakarta bandung).map do |city| city.capitalize end ["Jakarta", "Bandung"]
40. %w(jakarta bandung).map(&:capitalize) ["Jakarta", "Bandung"]
41. [ ["jakarta", "province"], ["bandung", "city"] ].each do |name, type| puts "#{name}_#{type}" end
42. "jakarta_province" "bandung_city" [ ["jakarta", "province"], ["bandung", "city"] ].each do |name, type| puts "#{name}_#{type}" end
43. This kind of flexibility improves the joy of programming
44. You might notice that Ruby makes you write fewer codes
45. one = 1 two = 2 three = 3 one, two, three = [1, 2, 3] one, two, three = 1, 2, 3 You don’t even need FLASHBACK!
46. [1, 2, 3, 4, 5].select(&:even?) [2,4] FLASHBACK!
47. Who doesn’t want to write less?
48. Have you tried programming with Ruby?
49. You might not noticed, but Mac users already have Ruby (even though its outdated) Installation is pretty easy: https://www.ruby-lang.org/en/docum entation/installation/
50. It only takes 20 minutes to learn Ruby from this page: https://www.ruby-lang.org/en/docu mentation/quickstart/
51. There is also tutorials in Bahasa Indonesia: https://www.idrails.com/
52. How about you try to learn together with fellow Rubyists?
53. Ruby community is known to be friendly (nice)
54. MINASWAN (Matz is nice and so we are nice) みなさん (read: mina-san) translation: everyone (polite)
55. MINASWAN (Matz is nice and so we are nice) みなさん (read: mina-san) translation: everyone (polite)
56. Friday Hug
59. In Indonesia, we are known as ID-Ruby We are active on Slack and Telegram
60. In Indonesia, we are known as ID-Ruby We are active on Slack and Telegram Feel free to join: http://ruby.id/slack and https://t.me/ruby_id
61. We held meetups regularly
62. We held meetups regularly
63. Ruby ecosystem is huge
64. More than 135,000 gems in rubygems.org
65. “Gems” are what we called as Ruby libraries
66. One of the most popular gem is Ruby on Rails framework
67. It is said that Rails made Ruby gaining popularity in 2006
68. Its over 10 years, but Rails is still on demand! https://infinum.co/the-capsized-eight/analyzing-rubygems-stats-v2016
69. Big companies that uses Ruby
70. • Github • Heroku • Airbnb • Shopify
71. How about in Indonesia?
72. • Bukalapak • Go-Jek • Midtrans • Vidio
73. Now you know!
74. List of Ruby companies in Indonesia can be seen in ID-Ruby homepage!
76. Feel free to browse http://ruby.id !
77. How about?
78. Started using Rails on ver 1.2.3 with Ruby 1.8.7
79. Current Rails version is 5.1 with Ruby 2.4 Started using Rails on ver 1.2.3 with Ruby 1.8.7 (2009!)
80. Previously we used ColdFusion
81. We have several large Rails applications running in Cookpad!
82. Our app servers run less than 100ms
83. If you are interested https://speakerdeck.com/mirakui/high-performance-rails-long-edition
84. If you are interested https://speakerdeck.com/a_matsuda/the-recip e-for-the-worlds-largest-rails-monolith
85. You can still be productive and run fast web application with Ruby on Rails